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                [Usaco2017 Open]Bovine Genomics                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div>Farmer John owns Ncows with spots and N cows without spots. Having just completed a course in bovine</div>
<div>&nbsp;genetics, he is convinced that the spots on his cows are caused by mutations in the bovine genome.A</div>
<div>t great expense, Farmer John sequences the genomes of his cows. Each genome is a string of length Mb</div>
<div>uilt from the four characters A, C, G, and T. When he lines up the genomes of his cows, he gets a ta</div>
<div>ble like the following, shown here for N=3:</div>
<div></div>
<div>Positions: &nbsp; &nbsp;1 2 3 4 5 6 7 ... M</div>
<div></div>
<div>Spotty Cow 1: A A T C C C A ... T</div>
<div>Spotty Cow 2: G A T T G C A ... A</div>
<div>Spotty Cow 3: G G T C G C A ... A</div>
<div></div>
<div>Plain Cow 1: &nbsp;A C T C C C A ... G</div>
<div>Plain Cow 2: &nbsp;A G T T G C A ... T</div>
<div>Plain Cow 3: &nbsp;A G T T C C A ... T</div>
<div></div>
<div>Looking carefully at this table, he surmises that positions 2 and 4 are sufficient to explain spotti</div>
<div>ness. That is, by looking at the characters in just these two positions, Farmer John can predict whi</div>
<div>ch of his cows are spotty and which are not (for example, if he sees G and C, the cow must be spotty</div>
<div>).Farmer John is convinced that spottiness can be explained not by just one or two positions in the&nbsp;</div>
<div>genome, but by looking at a set of three distinct positions. Please help him count the number of set</div>
<div>s of three distinct positions that can each explain spottiness.</div>
<div>
<div>给定n个A串和n个B串，长度均为m，求有多少三元组(x,y,z)，使得不存在一个A串a和一个B串b，使得</div>
<div>(a[x],a[y],a[z])=(b[x],b[y],b[z])</div>
<div>n&le;500,m&le;50</div>
</div>
<p></p></p><hr/><h3>输入格式</h3><p><div>The first line of input contains N(1&le;N&le;500) and M (3&le;M&le;50). The next N lines each contain a stri</div>
<div>ng of M characters; these describe the genomes of the spotty cows. The final Nlines describe the gen</div>
<div>omes of the plain cows.</div>
<p></p></p><hr/><h3>输出格式</h3><p><div>Please count the number of sets of three distinct positions that can explain spottiness. A set of th</div>
<div>ree positions explains spottiness if the spottiness trait can be predicted with perfect accuracy amo</div>
<div>ng Farmer John's population of cows by looking at just those three locations in the genome.</div>
<p></p></p><hr/><h3>样例输入</h3><pre>3 8
AATCCCAT
GATTGCAA
GGTCGCAA
ACTCCCAG
ACTCGCAT
ACTTCCAT
</pre><hr/><h3>样例输出</h3><pre>22</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Silver</p>
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